Personally, I'd remove the ground path for the ignition coil to shut off the
engine.  This will work for gasoline engines.  If you have a turbocharged
runaway diesel, best way is to remove your shirt and shove it into the
intake, or have a tube of silicone sealant handy to fix the leaking gasket
causing the runaway.  It is always safer to have the ground disrupted.
Mostly, on vehicles they control  the ground so that there is not any
voltages running through the firewall.  If the wire "grounds out" the
associated brake light or whatever will just be  on all the time.
Regards,
Mike
----- Original Message -----
From: "Douglas Butler" <dbutler@IMETRIX.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, August 09, 2001 7:50 PM
Subject: Re: [PIC]: Building a Servo


> >         I might also add a redundant kill switch with a
> > second transmitter and
> > receiver, the only problem, and this is something I was
> > planning to ask, is
> > how do you stop a gas engine remotely? I thought about
> > disconnecting the
> > spark plug but how would I do that considering the voltages involved?
> > Cutting the fuel flow is a second idea but my experience with
> > two stroke
> > engines is that they keep running, without any fuel flow for
> > at least 30
> > seconds, long enough to cause damage. Anybody have a better
> > idea? Thanks,
>
> How about some relay contacts across the breaker points for the ignition
> coil, assuming you have mechanical points vs. electronic ignition?  The
> voltages there are reasonable and without spark the engine should stop
> quickly.
>
> Sherpa Doug
>
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